So that is the thermostat...the triangular shape box on top where all of the hoses converge? Good to know. So some of you out there open that up and pour your antifreeze in there?

I have a fake lake that I use to suck up the antifreeze. I don't always run the engine with water first to heat it up though (in part, so I don't scald my hands when I'm draining everything). When I'm sucking antifreeze into the engine I usually see my temp get up into the 200s. Is that sufficient enough to get the engine to open up to the antifreeze? Just curious as I've been doing this for years and have never had an issue.

Quote:

Originally Posted by bochnak

My motor is an Indmar, not sure what yours is? Your boat is probably carbed and does not have a knock sensor like mine.

Thermostat is on top and personally would not remove it. Drain all water and let the impeller suck the RV through the motor.